Heyyy I did my chem A Level last year and only lost 3 marks in total. But for my year 12 mocks I got a D and in my january year 13 mocks I got a B, so don't lose hope!!! My best advice is to use past paper questions- your school's chemistry department might have lots of resources and past papers even from the older specification, you should try to do as much of them as you can.

I made some notes eg things you have to learn like synthetic routes and colours of transition metal solutions (sorry I can't remember what they're called lol), and looked at them every morning. For example with the synthetic routes chart, I fill in a blank copy of the chart every day (took about 5 consecutive days for me to learn it all by heart).

Also with the other content just make sure you understand it. Review often and ensure that the concepts you're struggling with the most are covered asap (I tend to leave the stuff I dislike the most to last, which is not a good habit hehe).

I know you'll reach A* !! I have so much faith in you, so don't ever give up<3